ASTM A213/A213M Type 309Nb Introduce
ASTM A213/A213M Type 309Nb steel is a ferritic and austenitic stainless steel alloy that is produced and regulated to meet ASTM A213/A213M standard specification for seamless ferritic and austenitic stainless steel tubes for boilers, superheaters, and heat exchangers. This steel offers a combination of corrosion resistance, toughness and strength, making it well-suited for a wide range of industrial applications.
Smelting temperature:1332°C - 1369°C
Application:Seamless ferritic and austenitic alloy steel boilers, superheaters and heat exchanger tubes
ASTM A213/A213M Type 309Nb Material Chemical Composition
The chemical composition of the ASTM A213/A213M Type 309Nb steel are as follows:
| Element | Min | Max |
|---|---|---|
| Molybdenum (Mo) | - | 0.7500 |
| Nickel (Ni) | 12.0000 | 18.0000 |
| Chromium (Cr) | 22.0000 | 24.0000 |
| PhOsphorus (P) | - | 0.0450 |
| Sulfur (S) | - | 0.0300 |
| Manganese (Mn) | - | 2.0000 |
| Silicon (Si) | - | 0.7500 |
| Carbon (C) | - | 0.0800 |
ASTM A213/A213M Type 309Nb Material Mechanical Properties
The mechanical properties of the ASTM A213/A213M Type 309Nb steel are as follows:
| YieldRp0.2 | ≤ 622 (MPa) |
| TeileRm | ≤ 282 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 32% |
| Reduction in cross section on fractureZ | 44% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 441 |
ASTM A213/A213M Type 309Nb Material Thermal Properties
The thermal performance parameters of the ASTM A213/A213M Type 309Nb steel are as follows:
| Temperature (°C) | 34 | 182 | 421 |
| Modulus of elasticity (GPa) | - | 217 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 43 |
| Thermal conductivity (W/m·°C) | - | 34.3 | 31.2 |
| Specific thermal capacity (J/kg·°C) | - | 242 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.13 | - | - |
| Deity (kg/dm³) | - | - | 211 |
| Poisson’s coefficient, ν | - | - | 342 |